[ferret_users] Plot.

Hi Folks,

I am trying to compare two datasets and trying to plot their difference as well i am using the scrip as mentioned below but i am getting the error as:::

"""""NOTE: Ambiguous coordinates on Y axis: TEMPERATURE[D=1,X=0.5]-POTTMP[D=2]
*** NOTE: Ambiguous coordinates on Z axis: TEMPERATURE[D=1,X=0.5]-POTTMP[D=2]
*** NOTE: Ambiguous coordinates on T axis: TEMPERATURE[D=1,X=0.5]-POTTMP[D=2]
**ERROR: illegal limits: POTTMP is not in the range T=13-MAY-3807 00:00:03-JUN-3807 00:00
Axis extremes are T=16-DEC-2007 12:00:16-DEC-2008 00:00"""""

Script is:::

yes? set mode metafile
yes? use pottm2008.nc
yes? use pottmp.2008.nc
yes? set reg/x=0.5E/y=35S/t=10-may-2008:31-may-2008/z=10:40
yes? let dT=TEMPERATURE[d=1]-POTTyes? use pottmp.2008.nc
yes? show grid pottmp
    GRID GCN2
name       axis              # pts   start                end
LON       LONGITUDE          360mr   0.5E                 0.5W
LAT       LATITUDE           418 r   74.5S                64.499N
LEVEL     DEPTH (m)           40 i- 5                    4478
TIME      TIME                12 i   01-JAN-2008 00:00    01-DEC-2008 00:00
normal    E
normal    F
MP[d=2]
yes? let dT=TEMPERATURE[d=1,x=0.5]-POTTMP[d=2]
yes? set window/size=.9
yes? set viewport UL
yes? fill/nolabel TEMPERATURE[d=1]
yes? contour/ov/nolabel/colour=7 TEMPERATURE[d=1]
yes? set viewport UR
yes? fill/nolabel POTTMP[d=2]
yes? contour/ov/nolabel/colour=7 POTTMP[d=2]
yes? set viewport LL
yes? fill/nolabel/pal=mycol3 dT

the data pottm2008.nc grids are as::

yes? use pottm2008.nc
yes? show grid temperature
    GRID GOZ1
name       axis              # pts   start                end
LONN2551_N551 LONGITUDE     2001mr   130W(-130)           30E(30)
LAT959_2051 LATITUDE        1093 i   39.976S              39.976N
LEV       DEPTH (m)           10 i- 0                    200
TIME1     TIME                32 r   08-MAY-2008 00:00    08-JUN-2008 00:00
normal    E
normal    F

And for the pottmp.2008.nc is as follows:::

yes? use pottmp.2008.nc
yes? show grid pottmp
    GRID GCN2
name       axis              # pts   start                end
LON       LONGITUDE          360mr   0.5E                 0.5W
LAT       LATITUDE           418 r   74.5S                64.499N
LEVEL     DEPTH (m)           40 i- 5                    4478
TIME      TIME                12 i   01-JAN-2008 00:00    01-DEC-2008 00:00
normal    E
normal    F

could you guys tell me where i am going wrong or why i am getting this error.

Regards,

Satyam Srivastava.